/*-
 * Copyright (c) 2009 Jonathan Anderson
 * All rights reserved.
 *
 * WARNING: THIS IS EXPERIMENTAL SECURITY SOFTWARE THAT MUST NOT BE RELIED
 * ON IN PRODUCTION SYSTEMS.  IT WILL BREAK YOUR SOFTWARE IN NEW AND
 * UNEXPECTED WAYS.
 * 
 * This software was developed at the University of Cambridge Computer
 * Laboratory with support from a grant from Google, Inc. 
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <errno.h>
#include <iostream>

#include <QString>

#include "AccessDeniedException.h"
#include "Client.h"
#include "ClientRequest.h"
#include "Idle.h"

using namespace std;
using namespace userAngel;


ClientState* Idle::handleSocketActivity(Client* client)
{
	struct ua_datum *d = ua_recv(client->socket(), NULL, NULL);

	if(!d)
	{
		QString message;
		if((errno == ENOENT) || (errno == ECONNRESET) || (errno == EAGAIN)
		   || (errno == EPIPE))
			message = "Socket closed";

		else message = "Error receiving request from client";

		throw ClientFatalException(client, message);
	}


	int bytes = 0;
	enum ua_request_t req;
	if(sizeof(enum ua_request_t) == sizeof(int32_t))
		bytes = ua_unmarshall_int(d, (int32_t*) &req);

	else if(sizeof(enum ua_request_t) == sizeof(int64_t))
		bytes = ua_unmarshall_long(d, (int64_t*) &req);

	else
	{
		QString message("unexpected sizeof(enum ua_request_t): %1");
		size_t size = sizeof(enum ua_request_t);

		throw ClientFatalException(client, message.arg(size));
	}


	if(bytes < 0)
		throw ClientFatalException(client, QString("received %1B").arg(bytes));


	ClientRequest* request = ClientRequest::req(req);
	if(!request) return NULL;

	cout << "Client " << client->socket() << ":\t" << request->name().toStdString();
	cout.flush();

	UserAngel::Datum datum = client->ua().recv();
	try { request->readArguments(client, datum); }
	catch(Exception& e)
	{
		throw ClientFatalException(client, e.message());
	}

	if(request->argString().length() > 0)
		cout << "(" << request->argString().toStdString() << ")";

	cout << "...";
	cout.flush();

	if(!client->allowed(req, datum))
		throw AccessDeniedException(request->name() + " (policy denial)");

	QString requestName = request->name();
	request->run(client);
	cout << " done." << endl;

	delete request; // TODO: memory leak

	return this;
}

